First, your plant looks fine!
I have this plant too and the advice you have got upt to now is correct but for one thing: they need lots of light, and even can put up with some sun, BUT if they get sun, the air movement must be strong and 24/7!
While mine is mostly yellow right now, it grows better - that is: faster - if kept more on the shadowy side.
If you chose to grow it with (some) sun - and behind a window - make sure to adapt it slowly and use some ventilators to give it the air movement which is necessary to cool the leaves and maintain the roots healthy, for it will need more watering this way.
And yes, they are slow. New growths can take months. And the flower spikes begin fast, and than slow down and need months, too. When you think it will abort, then suddenly appears a bud and the next development is fast again.
Luck with your plant!
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